Badiospeakek



Jan. 1925? 1,522,255

E. R. MEYER I RADIOSPEAKER Filed Sept, 21. 1923 0 INVENTOR [1 71217 1?. Meyer M: ATTORNEYS Patented Jan. 6, 1925.

EMIL R. MEYER, OF BROOKLYN, NEW YORK.

RADIOSIPEAKER.

I Application filed. September 21, 1923.

T ail whom it may concern:

Be it known that I, Earn. R. MEYER, a citizen of the ,United States, and resident of the )orough of Brooklyn, in the county of Queens, city andState of New York, have invented an Improvement in Radio speakers, of which the following is a specification.

My invention relates to instruments for amplifying. radio-telephony, and its object is to make intelligible to the human ear the sound waves without the discomfort often experienced from the pressure of the receivers on the ears.

Another object of the invention is to provide an instrument to which the ordinary telephone head pieces may be directly at tached. A further object is to provide a speaker which may be readily manufactured at relatively small expense.

The details of the invention are hereinafter particularly described.

In the accompanying drawings- Figure 1 is a front elevation on a small scale with the cover in place.

Fig. 2 is a side elevation of the same on a somewhat larger scale, the telephone receivers being removed.

Fig. 3 is a front elevationwith the cover removed.

Fig. 4 is a side. elevation of the same, the telephone receivers being removed.

Fig, 5 is a vertical section taken on the broken line 55 of Fig. 3 (the receivers being omitted) and Fig. 6 is a top view of the horn member,

with the member B removed.

Similar reference characters denote like parts throughout the several views.

Referring to the drawings, thehorn or speaker proper is designated generally by the reference letter A, and the intermediate connecting member between the telephone receivers 10, and the horn is indicated generally by the reference letter B.

The horn A comprises a flat horizontal bottom 11, vertically extending and convcrgent fiat side walls 12 and 13, the tops of which are inclined downwardly from the front to the rear ends; a flat top 1 L fixed to the top inclined edges of side walls, and a vertically arranged fiat back wall 15, fixed to the rear ends of the side walls which securely closes the rear end of the horn A.

A centrally located partition 16 within Serial No. 663,971.

the horn divides its interior into two equal compartments longitudinally.

This p artition extends from the back wall 15 to a predetermined point from the forward or open end of the horn.

and flat horizontal top 22.

The bottom edges of the vertical walls are glued or otherwise securely fixed to the top 14 of the horn A, and brace blocks 23 and 24L may be employed to strengthen the connection.

The joints in all parts of the horn A and member B, may be sealed in any desired manner so as to eliminate possibility of sound wave leakage.

The hollow body of the member B is divided into two equal passage ways 25 and 26, by-a central vertical partition 27 which is in alignment with the partition 16 in the horn A, and extends from the top 22 of the member B down to and upon the top edge of the partition 16, to which it is securely fixed by glue or other suitable means so as to render "the joint perfectly tight and leak proof. It will thus be seen that the passage ways 25 and 26 in the memberB communicate with the interior of the hornA through the opening 17 on each side of the partition 16.

The hollow interior of the member B, extends at its upper part below the top plate 22, in two right angle projections 28 and 29, one on each side and both covered by the top plate 22.

These hollow extenon head pieces made use of in receiving sound waves in radio apparatus.

The central openings 31 in the plates 30, register with the open ends of the hollow projections 28 and 29.

Within each of the depressions 32, and surrounding the openings 31, in the plates 30, 1 preferably provide a ring 33 of fibrous material, preferably of felt, against which the face of the telephone receiver is pressed when the device is in use, which prevents any leakage of the sound waves.

The bottom walls of the projections 28 and 29 are preferably slightly inclined downwardly from their outer ends towards the main body of the member B, so as to eliminate any abrupt edges in the passage ways for the sound waves.

As will be understood, the sound waves are delivered from the receivers 10 to the upper part of the member 15, into the passageways 25 and 26 at each side of the vertical partition 27, and pass through the opening 17 into the horn A, at each side of the partition 16, and in view of the fact that this partition does not extend to the extreme outer open end of the horn, the sound waves from both receivers commingle before passing out of the open end of the horn.

It will be noted that the passageways for the sound waves gradually and uniformly increase in dimension from the intake to the outlet points.

lVhile I prefer to make the members A and B of wood, and to make the walls and partitions of separate pieces of comparatively thin flat pieces of wood or veneer, it will be understood that these members may be made of any suitable material, and each entire member of a single piece of material.

In order to improve the outward appearance of the device, I prefer to employ a box like cover C, as shown in Figs. 1 and 2. This cover comprises vertical side walls 3a, a flat rearwardly inclined top 35, and flat vertical rear wall 36, leaving the bottom open, that the cover may be placed over the horn A and member B, there being an opening 37 cut in the fiat top of a size to permit of the passage therethrough of the top portion of the member'B, allowing the cover to be pushed down so that its side and rear walls entirely cover the horn. The front end of the cover may be entirely open or provided with ornamental openwork 38 as shown in Fig. 1.

A hood 39 attached to the top of the cover C, is placed over the opening 37 in the top of the cover, into which the top of the member B fits when the cover is placed over the horn. Both ends of the hood 39 are open, and when the cover is in place, the outer surfaces of the flat plates 30, are flush with the open ends of the hood so that the telephone receivers 10 may be applied in the same manner as when the cover is not used, and with the same facility.

It will be understood that either or both of the partitions 16 and 27 may be dispensed with, but I prefer to employ both of these members, as l have found in practice that much better result-s are obtained by their use.

I claim my invention-- 1. A radio speaker comprising a horn having flat walls tapering from front to rear, a hollow vertical member communicating at its bottom with the interior of the horn at its rear, and extended on both sides in opposite directions above the horn, a flat plate secured to each end of said extensions, and provided with a central opening registering with the open ends of said eXtensions.

2. A. radio speaker. (comprising a horn having fiat walls tapering from front to rear, a hollow vertical member communieating at its bottom with the interior of the horn at its rear end, and extended on both sides in opposite directions above the horn, a flat plate secured to each end of said eX- tensions provided with a central opening registering with the open ends of said extensions, and a central partition within said vertical member extending transversely thereof.

3. A radio speaker comprising a horn having flat walls tapering from front to rear, a central vertical partition therein ex tending longitudinally thereof from the rear wall. to a predetermined distance from the open end of the horn, a hollow vertical member communicating at its bottom with the interior of the horn at its rear end, and extended on both sides in opposite directions above. the horn, a flat plate secured to each end of said extensions and provided with a central opening registering with the open ends of said extensions, and a central partition within said vertical member extending transversely thereof.

Signed by me this 18th day of September, 1923.

EMIL R. MEYER. 

